Undefined Reference linker error for vsgconv

[robspearman]

I am trying to build the v1.1.3 tag linking with vsg v1.1.7 tag on Linux. Getting this linker error;

/usr/bin/c++ -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -DNDEBUG -Wl,-z,relro  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld CMakeFiles/vsgconv.dir/vsgconv.cpp.o -o ../../bin/vsgconv  -Wl,-rpath,/home/engineer/rpmbuild/BUILD/vsgXchange-1.1.3/lib: ../../lib/libvsgXchange.so.1.1.3 /usr/lib64/libvsg.so.1.1.7 /lib64/libvulkan.so -lpthread 
CMakeFiles/vsgconv.dir/vsgconv.cpp.o:(.data.rel.ro._ZTVN7vsgconv19CollectReadRequestsE[_ZTVN7vsgconv19CollectReadRequestsE]+0x748): undefined reference to `vsg::Visitor::apply(vsg::AnimationPath&)'
../../lib/libvsgXchange.so.1.1.3: undefined reference to `vsg::Object::Object(vsg::Object const&)'
collect2: error: ld returned 1 exit status

[robertosfield]

How are you going about building the VSG/vsgXchange? Using CMake or using your own build tools? What options are you using for build? I see a .so so this looks like you are building shared libraries.

FYI, my main development environment is Kubuntu 22.04, but I also have Kubuntu 24.04 and Windows 11 that I can build against.

[robspearman]

I am just using cmake and tried with no options or -DBUILD_SHARED_LIBS=ON.

[robertosfield]

I've just kicked off a shared libs build on my Kubuntu 22.04 system. I'm using a development branch of VSG right now, if that works fine I'll check out 1.1.7.

What compiler do you have on your system?

This is what I'm presently building the VSG one:

$ gcc --version
gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

As a test could you try a static build of the VSG, vsgXchange etc?

[robspearman]

gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-22)

A static VSG build does not change the error.

[robertosfield]

I just tried my Kubuntu 24.04 system with VSG v.1.1.7 and vsgXchange v.1.1.3 and it builds cleanly:

$ gcc --version
gcc (Ubuntu 13.2.0-23ubuntu4) 13.2.0
Copyright (C) 2023 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

So I guess there might be an issue with older compilers compatibility with modern C++17.

[robspearman]

OK, I'll see what else I can determine on my end.

[robertosfield]

Looking at your original link error:

/usr/bin/c++ -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -DNDEBUG -Wl,-z,relro  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld CMakeFiles/vsgconv.dir/vsgconv.cpp.o -o ../../bin/vsgconv  -Wl,-rpath,/home/engineer/rpmbuild/BUILD/vsgXchange-1.1.3/lib: ../../lib/libvsgXchange.so.1.1.3 /usr/lib64/libvsg.so.1.1.7 /lib64/libvulkan.so -lpthread 
CMakeFiles/vsgconv.dir/vsgconv.cpp.o:(.data.rel.ro._ZTVN7vsgconv19CollectReadRequestsE[_ZTVN7vsgconv19CollectReadRequestsE]+0x748): undefined reference to `vsg::Visitor::apply(vsg::AnimationPath&)'
../../lib/libvsgXchange.so.1.1.3: undefined reference to `vsg::Object::Object(vsg::Object const&)'
collect2: error: ld returned 1 exit status

It looks like vsgXchange is trying to build against VSG headers that define '''vsg::Object::Object(vsg::Object const&)''' but in VSG-1.1.7 the definition is '''Object(const Object& object, const CopyOp& copyop = {});'''

The code is: https://github.com/vsg-dev/VulkanSceneGraph/blob/master/include/vsg/core/Object.h#L64

My best guess on what might cause this would be having an older version of the VSG installed on your system with it's headers being picked up by vsgXchange. If it's not this then there is something odd going on with the compiler.

[robspearman]

I can confirm I had missed an old header version and problem is resolved. Thanks for the assistance!